The optimized ternary ISO compound (x = 1 NiCrFeO4) delivers the superior OER kinetics with a remarkable low overpotential value of 264 mV at a 10 mA cm⁻² current density, a low Tafel value of 45 mV dec⁻¹ under 1 M KOH. Systematic studies are performed to understand the extrinsic and intrinsic properties of the developed ISO compounds via tuning the physical properties and varying the compound composition. Herein, we develop a series of ternary metal-based inverse spinel oxide (ISO) compound, NiCrxFe2-xO4 (x: 0, 0.2, 0.4, 0.6, and 1.0) support with carbon for an efficient OER catalyst. The development of a cost-effective and highly efficient oxygen evolution reaction (OER) catalyst gain significant importance in sustainable energy conversion and storage applications.
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